Step stool



FIG. 1 is a front elevational view of the step stool showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is an top and front right perspective view thereof. 

The ornamental design for the step stool, as shown and described. 